iOS開發的一些奇巧淫技

橙子瓣發表於2015-06-09
iOS

TableView不顯示沒內容的Cell怎麼辦?

類似這種,我不想讓下面那些空的顯示.

01.png

 

很簡單.

1 self.tableView.tableFooterView = [[UIView alloc] init];

 

試過的都說好.

加完這句之後就變成了這樣.

02.png

 

自定義了leftBarbuttonItem左滑返回手勢失效了怎麼辦?

1 self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc]
2                                          initWithImage:img
3                                          style:UIBarButtonItemStylePlain
4                                          target:self
5                                          action:@selector(onBack:)];
6 self.navigationController.interactivePopGestureRecognizer.delegate = (id)self;

 

 

ScrollView莫名其妙不能在viewController劃到頂怎麼辦?

1 self.automaticallyAdjustsScrollViewInsets = NO;

 

 

鍵盤事件寫的好煩躁,都想摔鍵盤了,怎麼辦?

1.買個結實的鍵盤.

2.使用IQKeyboardManager(github上可搜尋),用完之後腰也不疼了,腿也不酸了.

為什麼我的app老是不流暢,到底哪裡出了問題?

如圖

03.gif

這個神器叫做:KMCGeigerCounter,快去github搬運吧.

怎麼在不新建一個Cell的情況下調整separaLine的位置?

1 _myTableView.separatorInset = UIEdgeInsetsMake(0, 100, 0, 0);

 

 

怎麼點選self.view就讓鍵盤收起,需要新增一個tapGestures麼?

1 - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
2 {
3    [self.view endEditing:YES];
4 }

 

 

怎麼給每個ViewController設定預設的背景圖片?

使用基類啊,少年。

想在程式碼裡改在xib裡新增的layoutAttributes,但是怎麼用程式碼找啊?

像拉button一樣的拉你的約束.nslayoutattribute也是可以拉線的.

怎麼像safari一樣滑動的時候隱藏navigationbar?

1 navigationController.hidesBarsOnSwipe = Yes

 

 

導航條返回鍵帶的title太討厭了,怎麼讓它消失!

1 [[UIBarButtonItem appearance] setBackButtonTitlePositionAdjustment:UIOffsetMake(0, -60)
2                                                      forBarMetrics:UIBarMetricsDefault];

 

 

CoreData用起來好煩,語法又臭又長,怎麼辦?

MagicRecord

CollectionView 怎麼實現tableview那種懸停的header?

CSStickyHeaderFlowLayou

能不能只用一個pan手勢來代替UISwipegesture的各個方向?

 1 - (void)pan:(UIPanGestureRecognizer *)sender
 2 {
 3 typedef NS_ENUM(NSUInteger, UIPanGestureRecognizerDirection) {
 4     UIPanGestureRecognizerDirectionUndefined,
 5     UIPanGestureRecognizerDirectionUp,
 6     UIPanGestureRecognizerDirectionDown,
 7     UIPanGestureRecognizerDirectionLeft,
 8     UIPanGestureRecognizerDirectionRight
 9 };
10 static UIPanGestureRecognizerDirection direction = UIPanGestureRecognizerDirectionUndefined;
11 switch (sender.state) {
12     case UIGestureRecognizerStateBegan: {
13         if (direction == UIPanGestureRecognizerDirectionUndefined) {
14             CGPoint velocity = [sender velocityInView:recognizer.view];
15             BOOL isVerticalGesture = fabs(velocity.y) > fabs(velocity.x);
16             if (isVerticalGesture) {
17                 if (velocity.y > 0) {
18                     direction = UIPanGestureRecognizerDirectionDown;
19                 } else {
20                     direction = UIPanGestureRecognizerDirectionUp;
21                 }
22             }
23             else {
24                 if (velocity.x > 0) {
25                     direction = UIPanGestureRecognizerDirectionRight;
26                 } else {
27                     direction = UIPanGestureRecognizerDirectionLeft;
28                 }
29             }
30         }
31         break;
32     }
33     case UIGestureRecognizerStateChanged: {
34         switch (direction) {
35             case UIPanGestureRecognizerDirectionUp: {
36                 [self handleUpwardsGesture:sender];
37                 break;
38             }
39             case UIPanGestureRecognizerDirectionDown: {
40                 [self handleDownwardsGesture:sender];
41                 break;
42             }
43             case UIPanGestureRecognizerDirectionLeft: {
44                 [self handleLeftGesture:sender];
45                 break;
46             }
47             case UIPanGestureRecognizerDirectionRight: {
48                 [self handleRightGesture:sender];
49                 break;
50             }
51             default: {
52                 break;
53             }
54         }
55         break;
56     }
57     case UIGestureRecognizerStateEnded: {
58         direction = UIPanGestureRecognizerDirectionUndefined;   
59         break;
60     }
61     default:
62         break;
63 }
64 }

 

 

拉伸圖片的時候怎麼才能讓圖片不變形？
1.UIImage *image = [[UIImage imageNamed:@"xxx"] stretchableImageWithLeftCapWidth:10 topCapHeight:10];

2.

05.gif


怎麼播放GIF的時候這麼卡，有沒有好點的庫？

FlipBoard出品的太適合你了：https://github.com/Flipboard/FLAnimatedImage

怎麼一句話新增上拉重新整理？

https://github.com/samvermette/SVPullToRefresh

1 [tableView addPullToRefreshWithActionHandler:^{
2 // prepend data to dataSource, insert cells at top of table view
3 // call [tableView.pullToRefreshView stopAnimating] when done
4 } position:SVPullToRefreshPositionBottom];

 

 

怎麼把tableview裡cell的小對勾的顏色改成別的顏色？

1 _mTableView.tintColor = [UIColor redColor];

 

 

04.png

本來我的statusbar是lightcontent的，結果用UIImagePickerController會導致我的statusbar的樣式變成黑色，怎麼辦？

1 - (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated
2 {
3     [[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleLightContent];
4 }

 

 

怎麼把我的navigationbar弄成透明的而不是帶模糊的效果？

1 [self.navigationBar setBackgroundImage:[UIImage new]
2                          forBarMetrics:UIBarMetricsDefault];
3 self.navigationBar.shadowImage = [UIImage new];
4 self.navigationBar.translucent = YES;

 

 

怎麼改變uitextfield placeholder的顏色和位置？

繼承uitextfield，重寫這個方法

1 - (void) drawPlaceholderInRect:(CGRect)rect {
2     [[UIColor blueColor] setFill];
3     [self.placeholder drawInRect:rect withFont:self.font lineBreakMode:UILineBreakModeTailTruncation alignment:self.textAlignment];
4 }

 

 

你為什麼知道這麼多奇怪的花招？

去stackoverflow刷問題啊，少年！

原文地址：http://www.cocoachina.com/ios/20141231/10783.html

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